linux-kernel - Re: [PATCH] arm64: dma-mapping: fix dma_to

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Date:	Thu, 17 Mar 2016 17:14:34 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	Robin Murphy <robin.murphy@....com>,
	linux-arm-kernel@...ts.infradead.org, timur@...eaurora.org,
	cov@...eaurora.org, nwatters@...eaurora.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Max Filippov <jcmvbkbc@...il.com>,
	Joe Perches <joe@...ches.com>,
	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Dean Nelson <dnelson@...hat.com>,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dma-mapping: fix dma_to_phys API for IOMMU attached devices

On Thursday 17 March 2016 12:07:26 Sinan Kaya wrote:
> On 3/17/2016 11:57 AM, Robin Murphy wrote:
>
> Let me know which direction I should go. 
> 
> 1. Fix phys_to_dma and keep dma_to_phys as in the patch.
> 2. Remove both of the API from header file, move it to where it is needed. Rename them as swio_phys_to_dma etc.

Use 2.

It has been a long way to remove all virt_to_bus/bus_to_virt users
from the common architectures, we are not putting them back under
a different name.

Drivers already know the physical address because that is what they
put into dma_map_*() in the first place.

	Arnd